Achieving net zero greenhouse gas emissions in the cement industry via value chain mitigation strategies
نویسندگان
چکیده
Cement is used globally in construction materials for nearly all civil infrastructure systems supporting improved quality of life, and there currently no substitute that can meet its functional capacity. The magnitude cement production leads to more than 7% annual anthropogenic greenhouse gas (GHG) emissions, resulting from both energy use chemical reactions, which imposes a notable barrier reach net zero emissions by 2050. This exacerbated the interconnectivity industries responsible consumption. Here, we articulate current emission reduction challenges facing products, propose compilation solutions focus on mitigating at various stages along value chain. We present frameworks design within circular economy policy decisions. anticipate these strategies deliver with GHG alleviate other environmental impacts. All economic sectors worldwide must achieve CO2 before 2050 limit warming 1.5°C above pre-industrial levels.1IPCCGlobal Warming 1.5°C. 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Beyond construction, mining, transportation, downstream driving increased include requirements windmill structures), transportation (rail, highways, ports, airfields), supply, stormwater handling, sea protection response climate change, disposal (some kilns manage wastes fuel), others. complex challenge requires integrated approach while materials. argue near-term long-term be implemented create pathways cement. Current efforts lower single points cycle, parts system received little serious attention. To consider supply chain complexity use. framework incorporates stages—manufacturing inclusion disposal—in loops closed extract maximum utility, integrated. Finally, decision-making support implementation strategies. forge consideration given depletion, mitigation benefit utilization, breakthroughs science. Key outlined Figure 1; include: (1) manufacturing level, including producers their chains; (2) specifying performance engineers); (3) companies (contractors), architects designers, clients; demolition companies, address chain, i.e., how design, construct, deconstruct systems.21Simpson Janda K.B. Owen Preparing ‘middle actors’ zero-carbon building transitions.Build. Cities. 610-624Crossref Challenges achieving large crushed rock, widely available, well-established been innovate.11Bataille just products like 60% occuring manufacture products,10Habert Scholar,22Pamenter Myers R.J. Decarbonizing cementitious cycle: whole-systems measures decarbonize UK European contexts.J. 25: 359-376https://doi.org/10.1111/jiec.13105Crossref (7) up depending mixture location.23Miller Monteiro Readily techniques cut 20%.Environ. Res. 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Production Low-CO2 Emissions.Waste Biomass Valor. 4745-4775https://doi.org/10.1007/s12649-020-01180-5Crossref (5) 26Habert Billard Rossi Chen Roussel improvement compared factor objectives.Cem. 2010; 40: 820-826Crossref (168) availability mature technologies, established chains, sunken costs long-lived facilities, difficulty attracting capital investments because relatively low profit margins make innovation difficult, particularly smaller, less players.27Wesseling J.H. der Vooren Lock-in systems: transformation clean Netherlands.J. 155: 114-124Crossref (36) archetype, plant viable decades 5 10 hourly, utilizing kiln 100 m 7 wide, changed last century. energy-derived kilns, internal temperatures 1,450°C, result decarbonation (see Box 1, highlights sources historical trends) clinker, precursor Portland common type used. policies cases reached marginal gains made without investment capture storage [CCS] utilization [CCU]).28Gartner E. Hirao associated binder phase concrete.Cem. 2015; 78: 126-142Crossref For example, projections International Energy Agency's low-carbon transition roadmap suggest thermal would contribute 3% projected 2050.6IEATechnology CCS technologies heavily studied, e.g., calcium looping,29Boot-Handford M.E. Abanades J.C. Anthony E.J. Blunt M.J. Brandani Mac Dowell Fernández J.R. Ferrari M.-C. Gross Hallett J.P. al.Carbon update.Energy 7: 130-189Crossref research into CCU much advanced. Furthermore, plants key player ability resources.30Chertow Ehrenfeld Organizing self-organizing systems.J. 13-27Crossref Scholar,31Reijnders scavenger ecology management hazardous substances.J. 2007; 15-25Crossref (44) Europe, safely burn waste,32Geng Y. Sarkis Bleischwitz How globalize economy.Nature. 2019; 565: 153-155Crossref (114) thus prolonging streams.33Malinauskaite Jouhara Czajczyńska Stanchev Katsou Rostkowski Thorne Colón Ponsá Al-Mansour al.Municipal solid waste-to-energy context recycling Europe.Energy. 141: 2013-2044Crossref (326) reduces streams, car tires, paints, animal meal, solvents, recover due factors incineration capacity use.Box 1Historical perspective why so decarbonizeOne first widespread utilizations was Romans, structures showing remarkable ingenuity. Roman concretes rely lime combination local (present-day Italy) volcanic pozzolans form materials,34Jackson M.D. Oleson Moon Zhang Gudmundsson M.T. Extreme durability ancient concretes.Am. Ceram. Soc. Bull. 97: 22-28Google leading remarkably durable structures. formation lime, Romans predominant modern cement,10Habert Scholar,35Dix western provinces.Oxford Archaeol. 1982; 331-346Crossref (20) direct take place heated lime:Quicklime, CaO: CaCO3 + heat → CaO CO2Hydrated Ca(OH)2: H2O Ca(OH)2 CO2Modern cements specific mineralogical compositions desired properties, reliant calcium-silicate compounds.36Mehta P.K. Concrete: Microstructure, Properties, Materials.3rd ed. McGraw-Hill, 2006Google minerals needed, ∼1,450°C. chemical-CO2 addition fraction figure below).Yet similar locally use: limestone, clay, siliceous abundant globally, although deposits varying purity.37West D.N. Clays. 2019Google Scholar,38Willett Stone (Crushed). local, resources, gain strength elapses if hydration place, wide-scale implementation.36Mehta economies grow, necessary infrastructure. One strongest corollaries rising gross domestic product (GDP) below).The shows production39Kelly T.D. Matos G.R. Historical statistics commodities States (2016 version). 2017.https://minerals.usgs.gov/minerals/pus/historical-statistics/Date: 2016Google population,40UNPDWorld Population Prospects 2019, Online Edition. 1. Nations, Dep. Econ. Aff. Popul. Div.https://population.un.org/wpp/Download/Standard/Population/Date: summed GDP nations,41Bolt Inklaar de Jong van Zanden Maddison Project Database, Version 2018: Rebasing ‘Maddison’: New Income Comparisons Shape Long-Run Economic Development.2018Google percent cement9Le 1960 2015, respectively. Please note that, report calcination-derived (solid line); estimated 1.67 times greater (dashed line). Modern below). Yet Several lock-in issues conventional Inexpensive locality primarily function transport costs, suggests susceptibility price competition transportation-related burdens,42Åhman Johansson industries.Clim. Policy. 17: 634-649Crossref noting also distances increase emissions.43Göswein Gonçalves Silvestre J.D. Freire Habert Transportation matters – does it? GIS-based comparative mixes ash, recycled aggregates.Resour. 137: 1-10Crossref occur provides; properties achieved, could entirely replace concrete. Engineers contractors who overlook emissions. nature contributes dependencies continuing same once start.12Krausmann There flexibility codes specify suitable physical loading conditions American Institute's code reinforced design44ACIBuilding Code Structural Concrete.2014Google Scholar); but rarely incentives choose alternatives constraints. enormous flows entering “waste” generated when they removed. 2015 US, 92 Mt were consumed39Kelly 40 removed use.45Miller role service-life resources.Environ. 15: 24004Crossref (6) outflows end-of-concrete delayed period structures, upswing lead anticipated substantial next 30+ installments demolished.45Miller
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ژورنال
عنوان ژورنال: One earth
سال: 2021
ISSN: ['2590-3322', '2590-3330']
DOI: https://doi.org/10.1016/j.oneear.2021.09.011